...walk away backwards? Why not 180 degrees?

That's the joke, and why it's still quoted.

On Reddit, maybe...

You moonwalk away

Don't turn your back on it, apparently

It's always watching....

Because the PS3 was coming out and they didn't want an Xbox 2 to compete with an PS3.

Always reminds me of this: https://www.youtube.com/watch?v=AiCF1QdyxhM

you walk into it

It was old the day it was memed.

I get that his comment didn't include any reference to machine learning or industry disruption, but did it need to be flagged into oblivion? seems like overkill. Just delete the whole subtree if it's offending people, keeping the sub-comments doesn't make any sense.